Mac Mail is great, but as with all things Mac, the simple user interface can sometimes feel a little prohibitive. I recently got stumped with an issue that was driving me crazy. Every time I hit “reply all” to a message, my name was ending up in the Cc: line despite my preferences explicitly telling Mail not to do that.
After thinking for a moment, it hit me. My account responds to two email addresses, i.e., “markmcb” was the alias for the actual account “mark”. Realizing that this wasn’t a normal situation, it made sense that it wouldn’t be a normal option. So I went to the plist editor for help.
~/Library/Preferences/com.apple.mail.plist and found the below entry. Note that only one address is listed.
All I had to do to make Mail function as I wanted it to was to add another sibling entry to the existing address listing, thus including the alias account. I hit save, restarted Mail, and bingo, no more Cc’ing myself. Simple, but not necessarily obvious. I hope that helps someone out there scouring the net in frustration as I was.